Platelets over 400 x 10^9/L may be caused by stress, primary thrombocythemia, and chronic granulocytic leukemia.
1. Stress: Stressful situations such as hyperthermia, burns, profuse vomiting, diarrhea, acute hemorrhage, etc. may lead to blood thickening and cause platelet concentration to increase.
2. Primary thrombocythemia: it is a clonal disease of bone marrow hematopoietic stem cells, with exuberant proliferation of megakaryocytes in the bone marrow, markedly increased peripheral platelet count, and accompanied by abnormal platelet function.
3. Chronic granulocytic leukemia: chronic granulocytic leukemia is caused by abnormal proliferation of hematopoietic stem cells in the bone marrow, which will cause an abnormal increase in megakaryocytes, i.e., an increase in platelet-producing cells, and ultimately lead to an increase in platelet count in the peripheral blood.
If the platelet count exceeds 400×10^9/L, you should go to the hospital in time, complete the examination, clarify the cause of the disease and then carry out targeted treatment under the guidance of the physician in a timely manner.